1 files changed, 78 insertions, 0 deletions
diff --git a/chromium/third_party/webxr_test_pages/webxr-samples/js/cottontail/src/geometry/cone-builder.js b/chromium/third_party/webxr_test_pages/webxr-samples/js/cottontail/src/geometry/cone-builder.js
new file mode 100644
index 00000000000..b1270156661
--- /dev/null
+++ b/chromium/third_party/webxr_test_pages/webxr-samples/js/cottontail/src/geometry/cone-builder.js
@@ -0,0 +1,78 @@
+// Copyright 2018 The Immersive Web Community Group
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+import {GeometryBuilderBase} from './primitive-stream.js';
+
+export class ConeBuilder extends GeometryBuilderBase {
+  pushCone(size = 0.5) {
+    let stream = this.primitiveStream;
+    let coneSegments = 64;
+
+    stream.startGeometry();
+
+    // Cone side vertices
+    for (let i = 0; i < coneSegments; ++i) {
+      let idx = stream.nextVertexIndex;
+
+      stream.pushTriangle(idx, idx + 1, idx + 2);
+
+      let rad = ((Math.PI * 2) / coneSegments) * i;
+      let rad2 = ((Math.PI * 2) / coneSegments) * (i + 1);
+
+      stream.pushVertex(
+          Math.sin(rad) * (size / 2), -size, Math.cos(rad) * (size / 2),
+          i / coneSegments, 0.0,
+          Math.sin(rad), 0.25, Math.cos(rad));
+
+      stream.pushVertex(
+          Math.sin(rad2) * (size / 2), -size, Math.cos(rad2) * (size / 2),
+          i / coneSegments, 0.0,
+          Math.sin(rad2), 0.25, Math.cos(rad2));
+
+      stream.pushVertex(
+          0, size, 0,
+          i / coneSegments, 1.0,
+          Math.sin((rad + rad2) / 2), 0.25, Math.cos((rad + rad2) / 2));
+    }
+
+    // Base triangles
+    let baseCenterIndex = stream.nextVertexIndex;
+    stream.pushVertex(
+        0, -size, 0,
+        0.5, 0.5,
+        0, -1, 0);
+    for (let i = 0; i < coneSegments; ++i) {
+      let idx = stream.nextVertexIndex;
+      stream.pushTriangle(baseCenterIndex, idx, idx + 1);
+      let rad = ((Math.PI * 2) / coneSegments) * i;
+      let rad2 = ((Math.PI * 2) / coneSegments) * (i + 1);
+      stream.pushVertex(
+          Math.sin(rad2) * (size / 2.0), -size, Math.cos(rad2) * (size / 2.0),
+          (Math.sin(rad2) + 1.0) * 0.5, (Math.cos(rad2) + 1.0) * 0.5,
+          0, -1, 0);
+      stream.pushVertex(
+          Math.sin(rad) * (size / 2.0), -size, Math.cos(rad) * (size / 2.0),
+          (Math.sin(rad) + 1.0) * 0.5, (Math.cos(rad) + 1.0) * 0.5,
+          0, -1, 0);
+    }
+
+    stream.endGeometry();
+  }
+}